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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9790937080ccfe64721a00122c41a1c04a2e98f3d943970fb0a571d8f8100b6' 
  AND token = 'gFQOoKSuF/E/HXRmkIlcs1e/V8jymfggXEnF0kbrJS0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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