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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afc591c6b853a28b8779a172c543af89f4be406a19798e21be398e1611c4780f' 
  AND token = 'Hp/gWqxc6SgZ6OFGK6RuySyYKb+56i1J83/9dObmcQA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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