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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93dd51bd34139895c9ac85c90e53a2c60d84fc389a26218f793e3ede5924d740' 
  AND token = 'M0mgH52/Ae9RvEp+AE9Y8eGmsIizWedKYuwEEwc5uxo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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