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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27a4c272e603b57dda7676380f09215deb5dbce4bd23cb87b60d5f8cdc3a70a5' 
  AND token = 'cHpBFlVlFfzWKZ9kHF7bRjyssK2ZAjwDXM3sDXUASq4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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