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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76e81690314e2afb06523e5b60dee06d87a8d8c16ecf5d2417a76ab7c61414b2' 
  AND token = 'V92Lqw20kLwundBmJ4vLctMs8T8WV37qcxHkOT8xzgo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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