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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c77390256bd29e1d65aa211a7bd648c95f51ee45f007f7c592ecd66a4db0f50' 
  AND token = 'VU9WMxIvu7wFD81Vgm0aS4ifmoGRuekhHzbu1cFYZdg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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