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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a146a18c53bf31210fe6c69d1950b5ee18a287eb5d9c1b7948854c5e375d658' 
  AND token = 'LjvrNJDQVayVBjgdMfdLl+Zvw62pwtPryOs577CSS6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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