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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '662f35962b7f45a1e9dc8c31f67a6664d3a82f80554e768ed7addcf0073be30c' 
  AND token = 'FLVup1M7G8m1uehEyuf8dx2tZ0ILvT7y1oQT9kd3qak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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