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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdb6a64f309d5e793718aa684bba4cf4ce80743f7e74e752e0b6f7f7e846ee84' 
  AND token = 'NIt79qZHzcG1anTNQdOEuBbns272oJMrgCpdvREgzMw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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