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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '214c2a1f3582d8ff8f0af840985aa999b5644b01618d9f2e224a80134800dd3f' 
  AND token = 'lg1gRe0fxkSgGpUyrSLywyaqnc9QIcqWlrf7ybQJvqg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}