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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c361a8978144e03cc5b19ee5aac65a91c7d3de7f84b161d34e8d2a63b8c90eed' 
  AND token = 'u3UrkRB9uzE3c9fRcvZ0HtPdeERI0LkHM97nAjWJ0nQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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