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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3024a054d36a626526356be1719fbd1e9f7e4af9374983dbedcc29d9f7a81e8' 
  AND token = 'j+V5av4/47BbxJW21P85y3gfkU6IQPUi3jjj1ad0txA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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