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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16302f7d56ead2006cb473e6460ffe328112e5261f6ff70862cf8b7f9ca7cfed' 
  AND token = 'nZRlxshUkk88G096/jyBVn1EkhjfvHsZ4mxdHsAl46g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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