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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34705e53e049402fb8f55689fae211f2fc87a64bb8f861285c50b07587b1327c' 
  AND token = 'a3hfEJPZMbKEtgSsm4A22zFJm/+UmTyyp0vh4pdCU2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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