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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88d11da12b8624d8d9ddc11e7f78eef684877a04209f037f1f9066db67f0cf23' 
  AND token = 'tCEJEGTOUlomLN6MtxCwHzFEsB7WbbjOJ6/RPV3uql8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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