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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d3e24ad647be5d5d0bbc778bcb8eb7200a4f354682664fde49d59ccc5103717' 
  AND token = 'apNzdJ07shVtIsykjzpcq6e8Rx71NLWaoILGr5BILJw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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