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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca244b103aa0bfe14c6863e61f53476e7b91d66500a49ccd4a4c8786073a7b3a' 
  AND token = '4hBzeEo+qsSB2Sek736TNuhYW/ENKK+OvqmreMqoJ28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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