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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6610e13d1459b123a2712e13f6df57cc4b5750b509690c436bccb60f63eb48b3' 
  AND token = 'BowLLRrNYD2zH1RwkUcLHWUwE+eaaSDECdKVLH22uf8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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