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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4076fb1991382e934e5663acbaa03d647e0a81518712ac030c45193155fe36a3' 
  AND token = 'DDOaenqIf0Rgp5OTeVIO1Uiw4sNB+Sw4DaLzEYrGtGw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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