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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24c9815d2bb53a56c937d1dbbb343dde3d1d101f4f946854d4cf7b5fc5f762f0' 
  AND token = 'YoTuG3iJINO5pfMHq+yfN14OBS8oWiboIWP18VohSxk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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