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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd3022269b5f2e84be33a60011f1b036ca6457e54cd9276d88ed2ab286f068a8' 
  AND token = 'k7TwlzA2fmCffMNBQkUmC/xvVr5PVJ2BA2ANR1Pjovc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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