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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5eab9598dfa948ee6e7daf72615d485a7b0537be9d432bebaa99ad075117540' 
  AND token = 'AZtSFOzd2uA71014CHbppIyZLgbrRcoHaFGXRJtkZwU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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