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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89f3a4b7198fbdc39c75bc1f382b8adc3cb31987f0b564f0fd5f7655a1dd64cf' 
  AND token = 'VYsPbfybM37Hjp3AhZzS7T1agJfJF6G+DXSnJ990uK0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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