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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c6d09b46668863ba5de0ee7897a6f2f1b382b96a6fa65d32e40f9e79efea716' 
  AND token = 'vwL9D71jWGD26n38yHXSgiJpU3PyMpk079W83g1OkWU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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