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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc32e08b2a661827df4861e73fa8be5eba8cdce1dcf44c623ab0f455ac5b8d64' 
  AND token = 'vtsiJH35ekUFFWccUYvV2PaW7NoNE9jFOGSERwHnTPk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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