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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f655b17491724bd948ffa4c81263c1c329e14e4da0bfc318e595605eef2402f' 
  AND token = 'Uk4sp6FiSEh/9oHKTIBuOkXP7YY5dacopNyJFL5eUb8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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