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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '411f614d12a6b1b4d9f0490849003e7042838131f1cdeddeb78ce26f9e074104' 
  AND token = 'KoMTwlZuPxgOhdFumCgZ77UHynm7JFKPhsSDZQe0x6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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