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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ada076c63d07f8cd1c0f38c74508f03c985970abab76fc28792bf99e692aaa39' 
  AND token = 'f5RYYzL4dCVZO+ToBStW1LWMUFXe9Oeafpd/f2EdJRk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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