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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de34ceb71cb9d0c8e9f04a6302be05b01848ff02579f48328991ec3534659e56' 
  AND token = '/DFEIpwM4a8UyHXs4eHXJe4HGc6j7ZqsD+QBcGIfusE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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