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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad51c3eb3b7e72e1e42b41d90c9a5d89afe8910a6a4cd157004805ae8b8d2828' 
  AND token = 'tPG3gWKZf2vScgGSKDrDl/S02pW0Faz9U6Bnd1ZDPZc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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