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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28bb2f8aa558ba530c7c496e565798f5d23f1feafae40d6bd5867171aeb1672b' 
  AND token = 'LaR+mvgtYfdL309kHYe+8qPH1roZUOlw5tLNRkA7rMg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00080

JSON explain

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