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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '861d7513fbba135c6d5c40d7e20bf04485b4d464a4b08b43ba5b5fc153cabfd3' 
  AND token = 'lzVcz+17JInywdYky8js5iF8pr/YUMFhXDlm75488Nw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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