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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30b67677cfbc266f1fc5ad7a4feb80a3f09122c4d58537014310ea4982606cda' 
  AND token = 'cKncofXu17If49fkZ//px5Q/JfwS721sEX7ZZTycnII=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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