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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b393647a83c0aba4a8fefd2e6c67e15b2a17253f050b284a0f61b285e554a2fc' 
  AND token = '3ikp26jRUXlx+QR3JZYYm7HJR0saZi2aSmLAjjv4nKw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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