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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae3bebf247a5adf45e8bc75f8652a43d7a6b7724343184b9e7e451e1dda258dc' 
  AND token = 'a1cpieXW9czWq90tYPlAX3TgYY/IbENUYkuAma8tja8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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