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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '608e867c5e7296999c102e1c8df3e803a5d15a5d5ab15fb23d510aed9a6a05bc' 
  AND token = '2alOpJe7xHnF/MPSxQ09WzHIU3PO+8B8urb3uYt0UBE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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