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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '958124e5ffc2fc5b1b4dee9a47995a273284cdb827c833fb4d398233a59a7ab5' 
  AND token = 'UsiDf5Zm7atW59He86JPFCwtarJ3Wm7BCIi5BSjmMAM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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