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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8debd0ce35d63dce8df3e56d5885151e243526068b2a42b51ae24282c771dfb' 
  AND token = 'xHbsg2xoQZcRl74GKGiY4HuhaB4BZnlVgh8APMbgdXM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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