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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fec17bdef3ef249f82331c9a885a54e13e55c3624fca10eeb74f2b50ab0c396f' 
  AND token = 'b4/s2z0CqKzd40mwXvsVykUca3W0b4DBrMJlI0BBC8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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