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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a48db0dda2ab24df738200bce3874ff14434ca4757853a44e71f4983753072c2' 
  AND token = 'baavCW9OT/XfN6JjFFfJYPzxwmSbbNou/Yo2BLVswwU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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