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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '056d8fb77f8a90b626d13c39311b41329e3eb662d5c47dc948263e8b4f7f08e7' 
  AND token = 'GPoyDUa/hUEVU2NMrzI9eB0TFtOEre1FZNp9JfJjS5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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