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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '616e9fc8179e75cb463ba20c6676f4fe648082a064fb9d0ce3b38f365f6262f9' 
  AND token = '1daoMM+oK51JCLmEzqZwt0CZTivNhrNqeL1CkwHfRaM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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