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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61b87a13e7b1cb89828f7e489826805d5b3be2e92fe430b0ebc10d119e0c5c95' 
  AND token = 'eDf9JMlis2SLuroCJZy4OFBFyEWDQZakfc8DuikSS+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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