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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66cf0331358c7d03277e0f43f74eb758cd02acc1e3c84f1444a08b42eee3ecc8' 
  AND token = 's3nquolK4qRk7h28g9QAACWSQqayMLWLNEp9hJEWEQw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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