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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfefa77eda0bdd0dc8faa9aad4655113ef4440a47ff67ae3435a80ac66bfe6fe' 
  AND token = 'bebn7jZqoTTv94L4oo0tsxlmDArHoHf7tG8CoNx/68U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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