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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf85d0f731a084913f07951a5ee065e5f7a8a6f5ec54fbfb7e5f9ea8de4b21c7' 
  AND token = 'P3CXj7Ej4y+ImXdoteXv8PxdObFFzG6WHjxfcTVzeuM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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