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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc623d903a4e1c80c6fa109e37931579bb812f5d5d613a79e8fae23d2bb60cf9' 
  AND token = 'kwY4rtL91DqQnl726JoBYRK8/YYUr/LufDG3fVYxW78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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