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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbcb4ffbb82de7545faa23caff9be25392680e52c2adb4f320d26245c625865a' 
  AND token = 'QO2ElqNL0LSWk3Qt+ZxKIe6GfWdY9j5wvNya2FdIQK4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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