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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6038ca1db64e9ebf7e9a4e86f09c706875e606a8d133ffc48f48aa9d7be697a5' 
  AND token = 'pjE9yoqpnbNFbAWx7YDdPrgjZnP22W8h9/8Rhfmcytc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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