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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bac54a115dd5e5744e10f9144038773d7b7da1d622bb060f6fe0d6ca1418753f' 
  AND token = 'kZNgstzN3drky3B24Xp4Zna05oArLxigZbOYweoWh2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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