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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f78a63bf7110f78df8f7d5bedc67498492786884a5342ab33d7050dc723c9814' 
  AND token = '5HSnjTcPsSBcljjLfgAu6bGxLydJxp52RyFwCJROJlk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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