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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a47239f3421067ee6e36aeb6590e2002ffa4a689fd931245f43a2b9f420560f' 
  AND token = 'l9kYgXTxemkpxm3b4nXUb/dlGKFWWxfoHzjM/MU6wWc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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