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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebee7d30f9da508ad74697a2d78c77aec50c1abf1ab0ac4669a2a43985930fc5' 
  AND token = 'RiEXlYK4+luaswGR9MGY8lVEA+xd2GjKaalZnL/JlYU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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