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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9466546d7af12e08b2d313ff0de3a45b42fa206e30cb8ae1ad7b572dd63cc51d' 
  AND token = 'YCuI/teR02rM/u8+MFnwy7SpPC8uLBl45Semsc16gq4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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