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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '115b1b8bd3d6235d6f0ae7472414ab906c59d72a99742e44f0bd00487be86822' 
  AND token = 'eBHhPjuXxfhIB5dSR9DLQjUUpJx5a8yBqyD+4MKryXM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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