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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f36289866705cea4c03a4a3701a88cae3739fc5e70e9cc949bac0127e3917f9' 
  AND token = 'IL3qpP54655iRGqttg0By8Xl1mO7KWrRTYY6BbCJ2uc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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