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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '347b04410b2a2570076b4685e7c1bd058e42f42f40a7f7d9f67f8b3347878b56' 
  AND token = 'ccW9lGXUebrzNPzBsqSmucmFC+LXdaLvE75Iqj+64lc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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