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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd57cde00749e71e36339ffa78a8d2b4d11fadce59e984d357cb8d235f6f61563' 
  AND token = '+RNSIraOZOnEDgX6KJV079zKv477KHypx1dLrguyZyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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