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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6946331a610e8d48ee31b0d7f71f1480140ef7aac42635910511a6a47c49e5ee' 
  AND token = '0ZtyZIMuiU7f1JUzIh2Q4lKo7eI05uiHSwABHU4FDnE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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