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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58e44f0629eeb473a3cdd621ea71eef4f8b3a00653e78663141dcd99578cc4db' 
  AND token = 'JJLS/dmj7nT13liGI4ofsCIvEJHO6mLl9Rt8aUnhByQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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