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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25289682ce9ce35f1491f159389094431f12deebbaf3b80d8bf7b3e18c61834a' 
  AND token = 'yu/vuUMr7+2h4KWwuHxzTz/0u74zitmvM4tsxyXJyrA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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