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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '542c0766f9d9e802e51edcd63a966b07a7b99d49947150e3bb7cab7b0e66c2ed' 
  AND token = 'TFgeu3i/8jjE++cIYcbHKVIvxnRnCI5m/AwPCI3N7zo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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