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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fe7c9e1d096efe8aa5baba326a60dda60e36e0628647e9b6a3665f8c341f93e' 
  AND token = 'VDUpdytPubVO9vVYoF3sMgzjEuznbMK+SpA8S/d138o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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