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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a56da221b7abbdb3c6d27a33179f9c579f32d98307fc5b390560479bb96f32c' 
  AND token = '70GYdFBpO5ing7GjSncNXn0U9Sd5lqn6dPlGPem+DkE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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