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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95d54d83e5fa7f930427b55f6d2fa634ce024c836b395fe6abd35775acc2a1aa' 
  AND token = 'EtBd2tuXlDNfuscDts4mbNqWfPvBAOBHhas5O6EV5+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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