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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e577f8f18bd81570485f8b91f0e5d78b9bcb404f174d9be5929541281ca0dc8a' 
  AND token = '0OprEUzkXqaHpYoRLRVTKwG107WnjxHfCb1KjCXarJM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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