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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb5e6bae5c8d35bed52db348cfd4ca8236aac6130a8d920845e7958a69c34520' 
  AND token = 'w5vihcv+YbEQME/DWB5b/ebrbTyjoWsF/atznCRJY0M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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