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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68771ac3bdb84563fa7f5f0a4a839c51bc0d0f3c12a06e6966ce7de4fbac64a3' 
  AND token = 'lqqfIgWor5I4xvG99NDkdA99YlU9AYzIi1CNkXsU/nk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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