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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cee45d03e7ea494c20b551362c469e513da2183ae6a1f77a9aba1b9dcee58407' 
  AND token = 'KAjwA9v6CpjK6gQ0TUl+dovpea3g18eUWblCXM+AERU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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