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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '823f3f07a35a594838baf0f5566c547334d4b2aba9a5f7cec1b555e143019a7a' 
  AND token = 'U41uSyenJcOXKJNqAxecyNY5BlFoe3G+CaZJP0cVuSI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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