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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6d12307bb877807ada179242c345749c2e0f67ab9b7c251ed82e3217cf421c2' 
  AND token = 'bnqSueP/32lFMKnA6btkNUw8acGBagU+ub6na/uUsM4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.01323

JSON explain

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