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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1669310246e702bcb97c287db19a89eb0fbd83c64d35de7a14249edea66fdd5e' 
  AND token = 'Dh/rEQ3Q0qrMSw4n9H+SmKeWNgKvju1dDiRRslc/C38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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