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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3142d751febae2daf8c7d0d612f316b78aeda884ff67e0efa18d9023d647abcf' 
  AND token = 'gddeWLcuFwmUGLgEKF3SXms7cC/nZD/5OARK9Ivmh+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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