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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '904d54b657884f04adf1c856d22489dbf1d3c0890d9cb80741db4c96d80571ae' 
  AND token = '1eXLoh/FERWeUc4b8OC92ldu995eP6Rq/m258/uTJts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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