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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86f4951f5e876c095db087bce78311d8e62d8b7023ca0eb453d00e936838e43c' 
  AND token = 'QnwI0mAS2bRHUL8cAVj/S0wlt2F4JKjDU0WVVi8z9J0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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