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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a80835f26d901f72aba159653e5fa1850d943f53b718893dffa267ffaaeb93a' 
  AND token = 'HfrVg9FW0yOP7qefS8eh8/W64YQMh1Kfv3Ehzf8jaDk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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